scsi: pm8001: Remove pm8001_tag_init()

In commit 5a141315 ("scsi: pm80xx: Increase the number of outstanding
I/O supported to 1024") the pm8001_ha->tags allocation was moved into
pm8001_init_ccb_tag(). This changed the execution order of allocation.
pm8001_tag_init() used to be called after the pm8001_ha->tags allocation
and now it is called before the allocation.

Before:

pm8001_pci_probe()
`--> pm8001_pci_alloc()
     `--> pm8001_alloc()
          `--> pm8001_ha->tags = kzalloc(...)
          `--> pm8001_tag_init(pm8001_ha); // OK: tags are allocated

After:

pm8001_pci_probe()
`--> pm8001_pci_alloc()
|    `--> pm8001_alloc()
|         `--> pm8001_tag_init(pm8001_ha); // NOK: tags are not allocated
|
`--> pm8001_init_ccb_tag()
     `-->  pm8001_ha->tags = kzalloc(...) // today it is bitmap_zalloc()

Since pm8001_ha->tags_num is zero when pm8001_tag_init() is called it does
nothing. Tags memory is allocated with bitmap_zalloc() so there is no need
to manually clear each bit with pm8001_tag_free().
Reviewed-by: Changyuan Lyu <changyuanl@google.com>
Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1666091763-11023-5-git-send-email-john.garry@huawei.comReviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/pm8001/pm8001_init.c

@@ -436,8 +436,6 @@ static int pm8001_alloc(struct pm8001_hba_info *pm8001_ha,
 		atomic_set(&pm8001_ha->devices[i].running_req, 0);
 	}
 	pm8001_ha->flags = PM8001F_INIT_TIME;
-	/* Initialize tags */
-	pm8001_tag_init(pm8001_ha);
 	return 0;
 
 err_out_nodev:

drivers/scsi/pm8001/pm8001_sas.c

@@ -96,13 +96,6 @@ int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out)
 	return 0;
 }
 
-void pm8001_tag_init(struct pm8001_hba_info *pm8001_ha)
-{
-	int i;
-	for (i = 0; i < pm8001_ha->tags_num; ++i)
-		pm8001_tag_free(pm8001_ha, i);
-}
-
 /**
  * pm8001_mem_alloc - allocate memory for pm8001.
  * @pdev: pci device.

drivers/scsi/pm8001/pm8001_sas.h

@@ -632,7 +632,6 @@ extern struct workqueue_struct *pm8001_wq;
 
 /******************** function prototype *********************/
 int pm8001_tag_alloc(struct pm8001_hba_info *pm8001_ha, u32 *tag_out);
-void pm8001_tag_init(struct pm8001_hba_info *pm8001_ha);
 u32 pm8001_get_ncq_tag(struct sas_task *task, u32 *tag);
 void pm8001_ccb_task_free(struct pm8001_hba_info *pm8001_ha,
 			  struct pm8001_ccb_info *ccb);